To help you prepare for the CCNP BCRAN exam, Brian Morgan and Craig Dennis discuss some of the advanced queuing techniques offered in Cisco IOS and compression techniques that are possible from Cisco routers.

The CCNP Remote Access exam requires you to have an in-depth understanding of
various WAN technologies. In this chapter, the discussion focuses on some of the
advanced queuing techniques offered in Cisco IOS. The latter part of this
chapter also discusses compression techniques that are possible from Cisco
routers.

There are various opinions on whether queuing is needed in a router, or in a
network. Normally, there are ways to justify the need for queuing, and the type
of queuing required. This chapter discusses the concepts behind queuing, when to
use queuing, and which type of queuing is best for a particular situation.

"Do I Know This Already?" Quiz

The purpose of the "Do I Know This Already?" quiz is to help you
decide whether you really need to read the entire chapter. If you already intend
to read the entire chapter, you do not necessarily need to answer these
questions now.

This ten-question quiz, derived from the major sections in the
"Foundation Topics" portion of the chapter, helps you determine how to
spend your limited study time.

Table 15-1 outlines the major topics discussed in this chapter and the
"Do I Know This Already?" quiz questions that correspond to those
topics.

The goal of self-assessment is to gauge your mastery of the topics in this
chapter. If you do not know the answer to a question or are only partially sure
of the answer, you should mark this question wrong for purposes of the
self-assessment. Giving yourself credit for an answer you correctly guess skews
your self-assessment results and might provide you with a false sense of
security.

Which network conditions justify the use of queuing? (Select two.)

High-bandwidth interfaces

Congested interfaces

Low-speed interfaces

LAN interfaces

Underutilized interfaces

Which effects does queuing have on a router? (Select two.)

Increases router performance

Decreases CPU load

Increases CPU load

Increases the bandwidth on an interface

Decreases router performance

Which queuing strategy uses the IP type of service (ToS) bits to help
determine egress priority?

First-In, First-Out queuing

Fair Queuing

Weighted Fair Queuing

Priority Queuing

How are packets sequenced when using FIFO queuing?

The shortest packets always go to the front of the queue.

The longest packets always go to the front of the queue.

The packets are sequenced based on when each respective first bit arrives
on the egress interface.

The packets are sequenced based on when each packet arrives entirely on
the egress interface.

Which Cisco IOS command is used to create a list of packets that match
one or more criteria?

class-map

policy-map

service-policy

class-list

Which Cisco IOS command determines how much bandwidth a particular flow
should get during congested conditions?

class-map

bandwidth

service-policy

policy

Which Cisco IOS command determines how much bandwidth a particular flow
should get at all times?

class-map

bandwidth

service-policy

policy

What is the difference between CBWFQ and LLQ?

There is no difference because they use the same IOS commands.

CBWFQ defines a priority queue that is used at all times whereas LLQ is
used only during congestion.

LLQ defines a priority queue that is used at all times whereas CBWFQ is
used only during congestion.

CBWFQ has more configuration options than LLQ.

Which of the following compression methods can be used only on
point-to-point links? (Select two.)

TCP header compression

Stac

Predictor

MPCC

IP header compression

Which of the following compression methods is Cisco-proprietary?

TCP header compression

Stac

Predictor

MPCC

The answers to the "Do I Know This Already?" quiz are found in
Appendix A, "Answers to the 'Do I Know This Already?' Quizzes and
Q&A." The suggested choices for your next step are as follows:

6 or fewer overall scoreRead the chapter. This includes the
"Foundation Topics," "Foundation Summary," and the
"Q&A" section.

7 or 8 overall scoreBegin with the "Foundation
Summary" section and then go to the "Q&A" section.

9 or more overall scoreIf you want more review of these
topics, skip to the "Foundation Summary" section and then go to the
"Q&A" section. Otherwise, move to the next chapter.